electric fuel pump

[navyboy]

just wanted to say I added a 6v electric fuel pump to assist my mechanical pump for hot/cold starts. installed it near the fuel tank, wired it with a fuse on negative side of battery with a hidden switch under the dash with wiring under the carpet and down and out where the electric exits the brake lights. works fantastic! should have done this a long time ago works as a great boost pump when needed.

[Merle Coggins]

just wanted to say I added a 6v electric fuel pump to assist my mechanical pump for hot/cold starts. installed it near the fuel tank, wired it with a fuse on negative side of battery with a hidden switch under the dash with wiring under the carpet and down and out where the electric exits the brake lights. works fantastic! should have done this a long time ago works as a great boost pump when needed.

 

I've done the same thing on my truck. It works great.

[pflaming]

Does location have any thing to do with performance? I have just added one to my truck, but without the use of the mechanical pump. I haven't tried to start the engine since the fire so I'm interested in the result.

[Don Coatney]

Does location have any thing to do with performance? I have just added one to my truck, but without the use of the mechanical pump. I haven't tried to start the engine since the fire so I'm interested in the result.

I would think an electric fuel pump would perform the same in California as it does in Wisconsin.

[desoto1939]

The location is important.  The electirc pumps are ment to be a pusher style pump and not a puller style. So they need to be located as close as possible to the fule tank to push the  fuel upto the carb.

 

ALso usea kill switch for these when not inuse.

 

Rich Hartung

Desoto1939@aol.com

[pflaming]

I can understand that it will pump beer, but I'm thinking wine might to too thick.

[blucarsdn]

The correct way to install an electic fuel pump is to incorporate a oil pressure switch in the sytem.. At cranking speed there is generally enough oil pressure to activate the switch.. The short side of this application is that the electric pump can't be used as a priming pump to assit with starting an engine that has not been run in a while. The positive side to this appication is that if the engine dies, or is killed during an accident, fuel will be cut off to the engine because of no oil pressure.

Careful attention should be paid to the type of electric pump is used if it is installed in tandum with the mechanical pump.. Not all of the electric pumps will allow a mechanical pump to pull fuel through the electric pump.. Bill

Edited April 15, 2014 by blucarsdn

[Don Coatney]

I don't believe modern car fuel pumps require oil pressure to run and they are installed correctly per all regulations. But modern fuel pumps all have an impact switch to prevent a crash and burn. If I were to install an electric pump in conjunction with a mechanical pump to be used for priming only I would power up the electric pump with a momentary contact (push and hold) switch.

[navyboy]

I did mine with a switch, but as a secondary safety added a indication light to know when the pump is working so I dont accidently leave the switch on leaving the car lol. But I havent had that problem as just like taking the ebrake off to drive. but yes needs to be as close to the tank as possible. its not really going to be needed under most use, however is great if the car has been sitting for a week and you need that pre boost, or after a decent drive and then you need to jump back in 5 min later as a boost for hot starts. one of the best things I have done with the 6v flatty other than the 6v alternator, 6v optima battery and a few other goodies.

[pflaming]

Why not just connect the pump to the key, key on / pump on;  key off / pump off. 

[DonaldSmith]

Don's saying this in love.

 

Fords have had an inertial cutoff switch with reset button in the trunk.

My daughter and her infant daughter had just left for home, years ago,when I got a call.  Her car had been bumped in a fender bender and her car wouldn't start.   I got there, pushed the reset button, and my daughter and granddaughter were on their way.

Maybe you could get an inertial switch somewhere. 

[builtfercomfort]

I got an inertial switch from a Ford truck off eBay for $12. I put it inside a large outdoor-grade plastic electrical junction box in my trunk near my battery where I have the fuel pump relay and various connectors. If you give the box a hard slap it will trip.

An oil pressure switch would work as well but this is less plumbing (would need a T on an oil sender) and less wiring (one less wire from motor to trunk).

Edited April 16, 2014 by builtfercomfort

[Lumpy]

Oil pressure switch and push button sounds like the way to go. At the moment I still have the Cremation Special set-up. Lucky for me I don't have a cat.

 

Builtfercomfort have you ever hit a bad chuck-hole or speed bump and had it switch off/trip?

 

ken

[DonaldSmith]

I control my electric fuel pump with a double-throw switch, one side momentary the other full-time.  I made an auxiliary panel with the parking brake light and switches for the instrument panel, fuel pump and pusher fan.  The pusher fan switch has automatic and always-on positions.

 

 

 

Oops. That's before the finished panel.

 

 

 

Edited April 16, 2014 by DonaldSmith

[navyboy]

doing it through the ignition is an option, however you have no control over it if you dont need it. as well if the key is left in the on position without the engine running the pump still will have flow, with the switch its off or on and with the indication light I would have to be stupid not to flip it. like I said though I dont run it to help blast down the road, its just used as a booster for hot/cold starts if needed. something I would recomend for others if they have experienced low fuel pressures under extreme heat.

[pflaming]

That is an incredible dash and I like the steering wheel center. VERY NICE!

 

[Merle Coggins]

I find that mine also helps at idle on hot summer days. When the under hood temps rise my mechanical fuel pump seems to struggle when sitting still and idling. The idle will get kind of rough, but when I switch on the electric pump it will smooth out. Once moving down the road again I can switch it off and all is well.

 

Now I finally have a heat shield over my mechanical pump so maybe that issue will go away now.

 

Merle

[builtfercomfort]

I've never had the switch trip by accident. When testing it I had to give the plastic box a good hard slap to get it to trip. I mean hard enough to hurt your hand, and worry about breaking the box mounting points. They came in ford trucks and see some rough duty.

[1950 Special Deluxe]

I don't believe modern car fuel pumps require oil pressure to run and they are installed correctly per all regulations. But modern fuel pumps all have an impact switch to prevent a crash and burn. If I were to install an electric pump in conjunction with a mechanical pump to be used for priming only I would power up the electric pump with a momentary contact (push and hold) switch.

I am thinking of doing exactly this on my 1950 Dodge Special Deluxe. (Canadian)

I have an Airtex E8011 electric fuel pump that I hope to use.

My plan is to install it on the frame near the tank with a fuel filter before the pump.

I have a Momemtary Contact Pushbutton to energize it to prime the engine.

I recently rebuilt the mechanical fuel pump with a kit from Then and Now Automotive.

The car runs fine with just the mechanical pump but needs a little help starting after sitting for a day or so.

From what I can determine, the mechanical pump should be able to pull thru the Airtex pump.

Does this seem workable?

Thanks

[ptwothree]

.

From what I can determine, the mechanical pump should be able to pull thru the Airtex pump.

Does this seem workable?

Thanks

I have one of my cars set up this way and the Airtex works with the stock pump just fine.  One problem I see is if the diaphragm 

in the mechanical pump springs a leak when the electric is running, the oil pan will fill up with gas faster then a cat can lick his...!

[1950 Special Deluxe]

I thought of this, but my plan is only to run it while starting.

[Niel Hoback]

  That is how I installed the same pump on my car. I had to remove it from the frame and make a softer suspension for it because its rather noisy. 

   Inside the mechanical pump there is a rubber seal around the link from the diaphragm to the arm. It will keep most of the gas from going up and over into the crankcase. some older pumps even have a small drain hole in the side of the housing next to the arm.  

   In the event of a total rupture of the diaphragm, fuel pressure would drop to near zero at the carb in a very short time.  It's my theory and I'm counting on it.

[1950 Special Deluxe]

Did you mount it back to the frame?

How did you cushion it?

Would a layer of rubber be enough?

I have some 3/8" I could use.

Thanks

Neil

[Niel Hoback]

   I had it mounted to two rubber strips hanging about 1/2" below the frame after moving it from directly bolted to the frame. It was still noisy, so I have it hanging by the rubber fuel lines which are suspended from the floor panel under the seat. I screwed little sheet metal angles to the floor and hung the lines with wire ties. I can still hear it, but it only runs when I think I need to prime the carb.

   Tailpipe hanger rubber, which is actually cut up tires, is too hard and transmits too much noise.

[desoto1939]

I have the Airtex Electric fuel pump installed on my 39 Desoto and it is attached to the frame near the gas tank.  I have an on/off toggle switch and when the unit is turned on I can hardly hear it run and I do not have any rubber mounting strips on my unit.

 

Rich HArtung

Desoto1939@aol.com